Ni-Cr-Mo合金旋压管材组织性能的研究
Study on Microstructure and Mechanical Properties of Ni-Cr-Mo Alloy Spinning Tube
金 军, 李德富, 郭胜利, 彭海健
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作者单位：（北京有色金属研究总院 加工工程研究中心，北京100088）
中文关键字：Ni-Cr-Mo合金； 强力旋压；管材；组织性能
英文关键字：Ni-Cr-Mo alloy; spinning; tubes; microstructure and mechanical properties
中文摘要：采用光学显微镜、扫描电镜及万能拉伸试验机等测试手段，研究了Ni-Cr-Mo合金铸态、旋压及固溶处理后管材的组织性能。结果表明：旋压后，晶粒沿管材的轴向被拉长，径向被压扁，晶粒内部存在大量的变形挛晶、变形带，有效地破碎了粗大的碳化物颗粒,管材的轴向强度略高于周向强度。固溶处理后，合金晶粒为等轴晶，晶粒内存在大量的退火挛晶，与铸态相比，其屈服强度、抗拉强度和伸长率分别提高了58.0％、44.9％和176.0％。铸态的断口韧窝较浅，部分呈沿晶断裂；旋压态断口韧窝内存在空洞，部分呈沿晶断裂；固溶态断口韧窝较深，表现为韧性断裂为主。
英文摘要：The microstructure and mechanical properties of tubes of Ni-Cr-Mo cast and after solution treatment and spinning were investigated by employing optical microscope, scanning electronic microscope and tensile testing machine. The results show that the grains are stretched with the axial of tubes and are staved along with the radial of tubes after spinning. There are a lot of deformation twins and slip exist in grain. Axial strength of tubes is stronger than circumferential strength after spinning, microstructure are equiaxed grains and annealing twins after solution treatment. Compared with cast condition, yield strength, tensile strength and elongation percentage of spinning tubes increase 58.0%, 44.9% and 176.0%, respectively. The fracture dimples of cast are fleet, and some are break up along with the direction of tubes and pipes. After spinning, fracture dimples have holes and some break up along with the direction of tubes and pipes. After solution condition, fracture dimples are deep and most of them are ductile fracture.